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A138777 as a simple table

na(n)
21
33
46
510
615
721
81
928
106
1136
1221
1345
1456
1555
16126
1766
18252
191
2078
21462
229
2391
24792
2545
26105
271287
28165
29120
302002
31495
32136
333003
341287
351
36153
374368
383003
3912
40171
416188
426435
4378
44190
458568
4612870
47364

[1,3,6,10,15,21,1,28,6,36,21,45,56,55,126,66,252,
 1,78,462,9,91,792,45,105,1287,165,120,2002,495,
 136,3003,1287,1,153,4368,3003,12,171,6188,6435,78,
 190,8568,12870,364]